import asyncio
import aioserial
async def read_and_print(aioserial_instance: aioserial.AioSerial):
    while True:
        print((await aioserial_instance.read_async()).decode(errors='ignore'), end='', flush=True)
asyncio.run(read_and_print(aioserial.AioSerial(port='COM1')))

import asyncio
import serial_asyncio
class Output(asyncio.Protocol):
    def connection_made(self, transport):
        self.transport = transport
        print('port opened', transport)
        transport.serial.rts = False  # You can manipulate Serial object via transport
        transport.write(b'Hello, World!\n')  # Write serial data via transport
    def data_received(self, data):
        print('data received', repr(data))
        if b'\n' in data:
            self.transport.close()
    def connection_lost(self, exc):
        print('port closed')
        self.transport.loop.stop()
    def pause_writing(self):
        print('pause writing')
        print(self.transport.get_write_buffer_size())
    def resume_writing(self):
        print(self.transport.get_write_buffer_size())
        print('resume writing')
loop = asyncio.get_event_loop()
coro = serial_asyncio.create_serial_connection(loop, Output, '/dev/ttyUSB0', baudrate=115200)
loop.run_until_complete(coro)
loop.run_forever()
loop.close()

import asyncio
import aioserial
async def read_and_print(aioserial_instance: aioserial.AioSerial):
    while True:
        data: bytes = await aioserial_instance.read_async()
        print(data.decode(errors='ignore'), end='', flush=True)
        if b'\n' in data:
            aioserial_instance.close()
            break
aioserial_instance: aioserial.AioSerial = aioserial.AioSerial(port='/dev/ttyUSB0', baudrate=115200)
asyncio.run(asyncio.gather(read_and_print(aioserial_instance), aioserial_instance.write_async(b'Hello, World!\n')))

>>> import aioserial
>>> import serial
>>> isinstance(aioserial.AioSerial(), serial.Serial)
True
>>> issubclass(aioserial.AioSerial, serial.Serial)
True
>>> aioserial.Serial is serial.Serial
True

aioserial_instance: aioserial.AioSerial = aioserial.AioSerial(
    # ... same with what can be passed to serial.Serial ...,
    loop: Optional[asyncio.AbstractEventLoop] = None,
    cancel_read_timeout: int = 1,
    cancel_write_timeout: int = 1)

bytes_read: bytes = \
    await aioserial_instance.read_async(size: int = 1)

at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.read_until_async(
        expected: bytes = aioserial.LF, size: Optional[int] = None)

number_of_byte_read: int = \
    await aioserial_instance.readinto_async(b: Union[array.array, bytearray])

a_line_of_at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.readline_async(size: int = -1)

lines_of_at_most_certain_size_of_bytes_read: bytes = \
    await aioserial_instance.readlines_async(hint: int = -1)

number_of_byte_like_data_written: int = \
    await aioserial_instance.write_async(bytes_like_data)

number_of_byte_like_data_in_the_given_list_written: int = \
    await aioserial_instance.writelines_async(list_of_bytes_like_data)